#include <cs50.h>
#include <stdio.h>
 
int main(void) {
	int n = 0;
	do {
		printf("请输入一个数字：");
		n = GetInt(); 
	} while(n < 1);
	 
	printf("\n");
	
	while (n > 1) {
		chorus(n--);
	}
	 
	return 0;
}
	
chorus (int a ) {
	string s1 = (a == 1) ? "bottle"  : "bottles";
	string s2 = (a == 2) ? "bottle"  : "bottles";
	
	printf("%d %s \n", a, s1);
	printf("%d %s \n", a-1, s2);
}

